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drm/radeon/kms: auto detect pcie link speed from root port

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This check the root ports supported link speeds and enables
GEN2 mode if the 5.0 GT link speed is available.

The first 3.0 cards are SI so they will probably need more investigation.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie
2012-06-27 08:35:54 +01:00
parent f42977841f
commit 197bbb3d46
4 changed files with 35 additions and 3 deletions
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12
drivers/gpu/drm/radeon/evergreen.c
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@@ -3421,7 +3421,8 @@ void evergreen_fini(struct radeon_device *rdev)
void evergreen_pcie_gen2_enable(struct radeon_device *rdev)
{
u32 link_width_cntl, speed_cntl;
u32 link_width_cntl, speed_cntl, mask;
int ret;
if (radeon_pcie_gen2 == 0)
return;
@@ -3436,6 +3437,15 @@ void evergreen_pcie_gen2_enable(struct radeon_device *rdev)
if (ASIC_IS_X2(rdev))
return;
ret = drm_pcie_get_speed_cap_mask(rdev->ddev, &mask);
if (ret != 0)
return;
if (!(mask & DRM_PCIE_SPEED_50))
return;
DRM_INFO("enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0\n");
speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
if ((speed_cntl & LC_OTHER_SIDE_EVER_SENT_GEN2) ||
(speed_cntl & LC_OTHER_SIDE_SUPPORTS_GEN2)) {